Charging circuit, charger and electrical equipment

Abstract

The utility model belongs to the technical field of charging, and provides a charging circuit, a charger and electrical equipment. The charging circuit comprises n sub-charging circuits and a comparison module, each sub-charging circuit comprises a DC / DC conversion module, a control module, a switch module and a voltage acquisition module, the input ends of all the DC / DC conversion modules are used for being electrically connected with a power supply, and the output ends of the DC / DC conversion modules are electrically connected with the first end of the switch module and the power supply end of the control module. The output ends of the n DC / DC conversion modules are connected in parallel, the control end of the switch module is electrically connected with the signal output end of the control module, the second end of the switch module is electrically connected with the first end of the voltage acquisition module, and the input end of the comparison module is electrically connected with the second ends of the n voltage acquisition modules. The output end of the comparison module is electrically connected with the signal receiving ends of the n control modules, the third end of the voltage acquisition module is used for being electrically connected with the battery module, and n is a natural number larger than or equal to 2.

Description

Technical Field

[0001] The present application belongs to the field of charging technology, and in particular relates to a charging circuit, a charger and an electrical device. Background Art

[0002] Agricultural plant protection drones are usually powered by multiple batteries. In order to ensure the normal use of agricultural plant protection drones, a charger is needed to charge the batteries for battery life. Traditional chargers can only charge one battery at a time, resulting in very low charging efficiency. In order to improve the charging efficiency, the relevant technology has proposed a new charger that can charge multiple batteries at the same time. However, there is a problem with this solution: when the voltages between multiple batteries are inconsistent, the battery with high voltage discharges to the battery with low voltage, causing a short circuit between the batteries. Utility Model Content

[0003] The embodiments of the present application provide a charging circuit, a charger and an electrical device, which can solve the problem that when an existing charger charges multiple batteries, due to inconsistent voltages among the multiple batteries, the battery with a high voltage discharges to the battery with a low voltage, thereby causing a short circuit between the batteries.

[0004] In a first aspect, an embodiment of the present application provides a charging circuit, comprising n sub-charging circuits and a comparison module, each of the sub-charging circuits comprising a DC / DC conversion module, a control module, a switch module and a voltage acquisition module, the input ends of all the DC / DC conversion modules are used to be electrically connected to a power supply, the output ends of the DC / DC conversion modules are respectively electrically connected to the first end of the switch module and the power supply end of the control module, the output ends of the n DC / DC conversion modules are connected in parallel, the control end of the switch module is electrically connected to the signal output end of the control module, the second end of the switch module is electrically connected to the first end of the voltage acquisition module, the input end of the comparison module is respectively electrically connected to the second ends of the n voltage acquisition modules, the output end of the comparison module is respectively electrically connected to the signal receiving ends of the n control modules, and the third end of the voltage acquisition module is used to be electrically connected to a battery module, wherein n≥2, and n is a natural number;

[0005] The DC / DC conversion module is used to convert the voltage provided by the power supply into a first voltage to power the control module; the voltage acquisition module is used to acquire the voltage of the battery module and transmit the voltage of the battery module to the comparison module; the comparison module is used to compare the voltages of n battery modules, and when the voltages of the n battery modules are different, determine the battery module with the lowest voltage, and send a first signal to the control module corresponding to the battery module with the lowest voltage, and send a second signal to the control modules corresponding to the remaining battery modules; wherein the first signal is used to instruct the control module to control the switch module to be turned on, and the second signal is used to instruct the control module to control the switch module to be turned off.

[0006] In a possible implementation manner of the first aspect, the DC / DC conversion module includes a DC / DC conversion unit, a positive input end of the DC / DC conversion unit is used to be electrically connected to the positive electrode of the power supply, a negative input end of the DC / DC conversion unit is used to be electrically connected to the negative electrode of the power supply, a positive output end of the DC / DC conversion unit is respectively electrically connected to the first end of the switch module and the positive power supply end of the control module, a negative output end of the DC / DC conversion unit is respectively electrically connected to the negative power supply end of the control module and the negative electrode of the battery module, and the positive output ends of n DC / DC conversion units are connected in parallel.

[0007] In a possible implementation manner of the first aspect, the DC / DC conversion module also includes a first diode, an anode of the first diode is electrically connected to the positive output terminal of the DC / DC conversion unit, a cathode of the first diode is electrically connected to the first end of the switch module and the positive power supply terminal of the control module, respectively, and the cathodes of n first diodes are connected in parallel.

[0008] In a possible implementation manner of the first aspect, the switch module includes a switch tube, a control end of the switch tube is electrically connected to the signal output end of the control module, a first end of the switch tube is electrically connected to the positive output end of the DC / DC conversion unit and the positive power supply end of the control module, respectively, and a second end of the switch tube is electrically connected to the first end of the voltage acquisition module.

[0009] In a possible implementation of the first aspect, the voltage acquisition module includes a first resistor and a second resistor, the first end of the first resistor is used to be electrically connected to the positive electrode of the battery module, the second end of the first resistor is respectively electrically connected to the second end of the switch module, the input end of the comparison module and the first end of the second resistor, and the second end of the second resistor is grounded.

[0010] In a possible implementation manner of the first aspect, the voltage acquisition module also includes a first capacitor, a first end of the first capacitor is electrically connected to the second end of the first resistor, the first end of the second resistor, the second end of the switch module and the input end of the comparison module, respectively, and a second end of the first capacitor is grounded.

[0011] In a possible implementation manner of the first aspect, the control module includes a microprocessor, a signal receiving end of the microprocessor is electrically connected to the output end of the comparison module, a positive power supply end of the microprocessor is electrically connected to the positive output end of the DC / DC conversion unit and the first end of the switch module, a negative power supply end of the microprocessor is electrically connected to the negative output end of the DC / DC conversion unit and the negative electrode of the battery module, and a signal output end of the microprocessor is electrically connected to the control end of the switch module.

[0012] In a second aspect, an embodiment of the present application provides a charger, comprising the charging circuit described in any one of the first aspects.

[0013] In a third aspect, an embodiment of the present application provides an electrical device, including an adaptable and connected electrical device and the charger described in the second aspect; or,

[0014] It comprises an adaptably connected battery module and a charging circuit as described in any one of the first aspects.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0016] An embodiment of the present application provides a charging circuit, comprising n sub-charging circuits and a comparison module, each sub-charging circuit comprising a DC / DC conversion module, a control module, a switch module and a voltage acquisition module, the input ends of all DC / DC conversion modules are used to be electrically connected to a power supply, the output ends of the DC / DC conversion modules are respectively electrically connected to a first end of a switch module and a power supply end of the control module, the output ends of the n DC / DC conversion modules are connected in parallel, the control end of the switch module is electrically connected to a signal output end of the control module, the second end of the switch module is electrically connected to a first end of the voltage acquisition module, the input end of the comparison module is respectively electrically connected to the second ends of the n voltage acquisition modules, the output end of the comparison module is respectively electrically connected to the signal receiving ends of the n control modules, and the third end of the voltage acquisition module is used to be electrically connected to a battery module, wherein n≥2, and n is a natural number.

[0017] The DC / DC conversion module is used to convert the voltage provided by the power supply into a first voltage to supply power to the control module. The voltage acquisition module is used to acquire the voltage of the battery module and transmit the voltage of the battery module to the comparison module. The comparison module is used to compare the voltages of n battery modules. When the voltages of the n battery modules are different, the battery module with the lowest voltage is determined, and a first signal is sent to the control module corresponding to the battery module with the lowest voltage, and a second signal is sent to the control modules corresponding to the remaining battery modules. The first signal is used to instruct the control module to control the switch module to turn on, and the second signal is used to instruct the control module to control the switch module to turn off.

[0018] When the voltages of n battery modules are different, the charging circuit provided in the embodiment of the present application will first determine the battery module with the lowest voltage, and then control the switch module corresponding to the battery module with the lowest voltage to be turned on to charge the battery module with the lowest voltage. At the same time, the switch modules corresponding to the remaining battery modules are controlled to be disconnected, and the remaining battery modules cannot be charged. Since the charging circuits of the remaining battery modules are in a disconnected state, the remaining battery modules cannot discharge to the battery module with the lowest voltage, thereby solving the problem of inconsistent voltages among multiple batteries, which causes batteries with high voltages to discharge to batteries with low voltages, thereby causing a short circuit between the batteries.

[0019] It can be understood that the beneficial effects of the second to third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 is a principle block diagram of a charging circuit provided in an embodiment of the present application;

[0022] Figure 2 is a circuit connection diagram of a charging circuit provided in an embodiment of the present application;

[0023] Figure 3 is a circuit connection diagram of a charging circuit provided in another embodiment of the present application;

[0024] Figure 4 is a principle block diagram of an electrical device provided by an embodiment of the present application;

[0025] Figure 5 It is a principle block diagram of an electrical device provided in another embodiment of the present application.

[0026] In the figure: 1. Charging circuit; 2. Charger; 3. Electrical equipment; 10. Sub-charging circuit; 20. Comparison module; 30. Battery module; 40. Power supply; 11. DC / DC conversion module; 12. Control module; 13. Switch module; 14. Voltage acquisition module. DETAILED DESCRIPTION

[0027] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0028] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0029] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0030] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0032] The cruising time of agricultural plant protection UAVs is limited by the capacity of the battery. The cruising time of a single battery is usually 10 minutes. Since the cruising time of a single battery is relatively long, in order to increase the cruising time, 2-4 batteries are usually configured on agricultural plant protection UAVs to ensure that the UAV can work continuously and uninterruptedly, thereby improving work efficiency.

[0033] Since agricultural plant protection drones are equipped with multiple batteries, a charger is needed to charge the batteries for battery life. Traditional chargers can only charge one battery at a time, resulting in very low charging efficiency. In order to improve the charging efficiency, the relevant technology has proposed a new charger that can charge multiple batteries at the same time. However, there is a problem with this solution: when the voltages between multiple batteries are inconsistent, the battery with high voltage discharges to the battery with low voltage, causing a short circuit between the batteries.

[0034] In view of the above problems, the present application provides a charging circuit, such as Figure 1 The charging circuit 1 includes n sub-charging circuits 10 and a comparison module 20, each sub-charging circuit 10 includes a DC / DC conversion module 11, a control module 12, a switch module 13 and a voltage acquisition module 14, the input ends of all DC / DC conversion modules 11 are used to be electrically connected to the power supply 40, the output ends of the DC / DC conversion modules 11 are respectively electrically connected to the first end of the switch module 13 and the power supply end of the control module 12, the output ends of the n DC / DC conversion modules 11 are connected in parallel, the control end of the switch module 13 is electrically connected to the signal output end of the control module 12, the second end of the switch module 13 is electrically connected to the first end of the voltage acquisition module 14, the input end of the comparison module 20 is respectively electrically connected to the second ends of the n voltage acquisition modules 14, the output end of the comparison module 20 is respectively electrically connected to the signal receiving ends of the n control modules 12, and the third end of the voltage acquisition module 14 is used to be electrically connected to the battery module 30, wherein n≥2, and n is a natural number.

[0035] In the embodiment of the present application, the DC / DC conversion module 11 is used to convert the voltage provided by the power supply 40 into a first voltage to supply power to the control module 12. The voltage acquisition module 14 is used to acquire the voltage of the battery module 30 and transmit the voltage of the battery module 30 to the comparison module 20. The comparison module 20 is used to compare the voltages of n battery modules 30. When the voltages of the n battery modules 30 are different, the battery module 30 with the lowest voltage is determined, and a first signal is sent to the control module 12 corresponding to the battery module 30 with the lowest voltage, and a second signal is sent to the control modules 12 corresponding to the remaining battery modules 30. Among them, the first signal is used to instruct the control module to control the switch module to be turned on, and the second signal is used to instruct the control module to control the switch module to be turned off.

[0036] When the voltages of n battery modules 30 are different, the charging circuit 1 provided in the embodiment of the present application will first determine the battery module 30 with the lowest voltage, and then control the switch module 13 corresponding to the battery module 30 with the lowest voltage to be turned on to charge the battery module 30 with the lowest voltage. At the same time, the switch modules 13 corresponding to the remaining battery modules 30 are controlled to be disconnected, and the remaining battery modules 30 cannot be charged. Since the charging circuits of the remaining battery modules 30 are in a disconnected state, the remaining battery modules 30 cannot discharge to the battery module 30 with the lowest voltage, thereby solving the problem of inconsistent voltages among multiple batteries, which causes batteries with high voltages to discharge to batteries with low voltages, thereby causing a short circuit between the batteries.

[0037] When the voltage of the battery module 30 with the lowest voltage is charged to the same voltage as the battery module 30 with the second lowest voltage, the switch module 13 corresponding to the battery module 30 with the second lowest voltage is controlled to be turned on to charge the battery module 30 with the second lowest voltage, and then the same process is repeated until the voltages of all battery modules 30 are the same, then all switch modules 13 are controlled to be turned on, and the n DC / DC conversion modules 11 charge the n battery modules 30 respectively.

[0038] It should be noted that when the charging circuit of the remaining battery module 30 is disconnected, the corresponding DC / DC conversion module 11 will charge the battery module 30 with the lowest voltage together, so the charging power of the battery module 30 with the lowest voltage can be increased. For example: there are 2 sub-charging circuits 10 and 2 battery modules 30, one of which has a low voltage and the other has a high voltage, then the battery module 30 with the high voltage is stopped from being charged, and the two DC / DC conversion modules 11 will charge the battery module 30 with the low voltage together, that is, the battery module 30 with the low voltage is charged at 2 times the power, and when the voltage of the battery module 30 with the low voltage is charged to the same voltage as the battery module 30 with the high voltage, the battery module 30 with the high voltage will start to be charged, that is, each battery module 30 is charged at 1 times the power.

[0039] When the voltages of the n battery modules 30 are the same, the third signal is output to the n control modules 12 respectively. The n control modules 12 are respectively used to control the corresponding switch modules 13 to be turned on according to the third signal. The n DC / DC conversion modules 11 charge the n battery modules 30 respectively, that is, each battery module 30 is charged at 1 times the power.

[0040] It should be noted that the charging circuit 1 provided in the embodiment of the present application can set the number of battery modules 30 to be connected according to user needs, and the present application does not limit the charging circuit 1 to be connected to n battery modules 30. The fewer the number of battery modules 30 connected to the charging circuit 1, the greater the charging power of the battery module 30, the faster the charging speed, and the charging time is saved.

[0041] The charging circuit 1 provided in the embodiment of the present application can charge multiple battery modules 30 at the same time, saving charging time, improving charging efficiency, and better ensuring uninterrupted operation of the drone.

[0042] For example, the battery module 30 may be a single battery or a plurality of single batteries connected in series. In the present application, the battery module 30 is taken as a single battery as an example to illustrate the working principle of the charging circuit 1.

[0043] like Figure 2 As shown, the DC / DC conversion module 11 includes a DC / DC conversion unit, the positive input terminal of the DC / DC conversion unit is used to be electrically connected to the positive pole of the power supply 40, the negative input terminal of the DC / DC conversion unit is used to be electrically connected to the negative pole of the power supply 40, the positive output terminal of the DC / DC conversion unit is respectively electrically connected to the first end of the switch module 13 and the positive power supply terminal of the control module 12, the negative output terminal of the DC / DC conversion unit is respectively electrically connected to the negative power supply terminal of the control module 12 and the negative pole of the battery module 30, and the positive output terminals of n DC / DC conversion units are connected in parallel.

[0044] In the embodiment of the present application, the DC / DC conversion unit is used to convert the voltage provided by the power supply 40 into a first voltage to supply power to the control module 12 .

[0045] like Figure 3 As shown, the DC / DC conversion module 11 also includes a first diode D1, an anode of the first diode D1 is electrically connected to the positive output terminal of the DC / DC conversion unit, a cathode of the first diode D1 is electrically connected to the first end of the switch module 13 and the positive power supply terminal of the control module 12, respectively, and the cathodes of n first diodes D1 are connected in parallel.

[0046] In the embodiment of the present application, the first diode D1 is provided in each DC / DC conversion module 11 to prevent crosstalk between the n DC / DC conversion modules 11 and ensure that the charging circuit 1 works more stably.

[0047] It should be noted that the DC / DC conversion module 11 may also be replaced by other modules that realize its functions, and is not limited thereto.

[0048] like Figure 2 and Figure 3 As shown, the switch module 13 includes a switch tube Q, the control end of the switch tube Q is electrically connected to the signal output end of the control module 12, the first end of the switch tube Q is electrically connected to the positive output end of the DC / DC conversion unit and the positive power supply end of the control module 12, and the second end of the switch tube Q is electrically connected to the first end of the voltage acquisition module 14.

[0049] In the embodiment of the present application, the charging circuit of each battery module 30 can be controlled to be turned on or off by controlling the on or off of the switch tube Q.

[0050] It should be noted that the switch module 13 may also be replaced by other modules that realize its functions, but is not limited thereto.

[0051] like Figure 2 As shown, the voltage acquisition module 14 includes a first resistor R1 and a second resistor R2, the first end of the first resistor R1 is used to be electrically connected to the positive electrode of the battery module 30, the second end of the first resistor R1 is electrically connected to the second end of the switch module 13, the input end of the comparison module 20 and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded. Figure 2 It can be known that the second end of the first resistor R1 is electrically connected to the second end of the switch tube Q, the input end of the comparison module 20, and the first end of the second resistor R2. It should be noted that the first end of the first resistor R1 is the third end of the voltage acquisition module 14, and the second end of the first resistor R1 is the first end and the second end of the voltage acquisition module 14.

[0052] In the embodiment of the present application, the voltage of the battery module 30 is collected by the first resistor R1 and the second resistor R2.

[0053] like Figure 3 As shown, the voltage acquisition module 14 further includes a first capacitor C1, a first end of the first capacitor C1 is electrically connected to the second end of the first resistor R1, the first end of the second resistor R2, the second end of the switch module 13 and the input end of the comparison module 20, and a second end of the first capacitor C1 is grounded. Figure 3 It can be known that the first end of the first capacitor C1 is electrically connected to the second end of the first resistor R1 , the first end of the second resistor R2 , the second end of the switch Q and the input end of the comparison module 20 .

[0054] In the embodiment of the present application, providing the first capacitor C1 in the voltage acquisition module 14 can ensure that the voltage of the battery module 30 acquired is more stable.

[0055] It should be noted that the voltage acquisition module 14 may also be replaced by other modules that realize its functions, and is not limited thereto.

[0056] like Figure 2 and Figure 3 As shown, the control module 12 includes a microprocessor, a signal receiving end of the microprocessor is electrically connected to the output end of the comparison module 20, a positive power supply end of the microprocessor is electrically connected to the positive output end of the DC / DC conversion unit and the first end of the switch module 13, a negative power supply end of the microprocessor is electrically connected to the negative output end of the DC / DC conversion unit and the negative electrode of the battery module 30, and a signal output end of the microprocessor is electrically connected to the control end of the switch module 13. Figure 2 and Figure 3 It can be seen that the positive power supply terminal of the microprocessor is electrically connected to the positive output terminal of the DC / DC conversion unit and the first terminal of the switch tube Q. The signal output terminal of the microprocessor is electrically connected to the control terminal of the switch tube Q.

[0057] In the embodiment of the present application, the microprocessor is used to control the corresponding switch tube Q to be turned on or off according to the signal output by the comparison module 20, so as to control the charging circuit of the corresponding battery module 30 to be turned on or off.

[0058] It should be noted that the microprocessor has a voltage conversion function. When the power supply voltage of the microprocessor is different from the charging voltage of the battery module 30, the microprocessor can achieve its power supply demand through its own voltage conversion function.

[0059] The embodiment of the present application also provides a charger 2, which includes the charging circuit 1 described above. The specific structure of the charging circuit 1 refers to the above embodiment. Since the charger 2 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0060] In the embodiment of the present application, the charger 2 is configured with 1 power input port and n charging ports, the power input port is electrically connected to the input end of the DC / DC conversion module 11 in the n sub-charging circuits 10, and the n charging ports are electrically connected to the third end of the voltage acquisition module 14 in the n sub-charging circuits 10 and the n battery modules 30 respectively. When the charger 2 charges the n battery modules 30, it can ensure that the battery module 30 with a high voltage will not discharge like the battery module 30 with a low voltage. At the same time, the charger 2 can charge multiple battery modules 30 at the same time, saving charging time and improving charging efficiency to meet the uninterrupted operation of the drone.

[0061] like Figure 4 As shown, the embodiment of the present application also provides an electrical device, which includes an adaptable connected electrical device 3 and a charger 2, or as shown in Figure 5 As shown, the electrical device includes an adaptably connected battery module 30 and a charging circuit 1; the specific structure of the charger 2 or the charging circuit 1 refers to the above-mentioned embodiment. Since the electrical device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0062] In the embodiment of the present application, the charging circuit 1 can be set in the electric device 3 or be separately adapted and connected to the electric device 3. When set in the electric device 3, the electric device is the electric device 3, which has a battery module 30 and a charging circuit 1 for charging the battery module 30. At the same time, the electric device is configured with corresponding power input ports and charging ports.

[0063] Exemplarily, the electrical device is an agricultural plant protection drone.

[0064] And when the charging circuit 1 is separately adapted and connected to the power-consuming device 3, the charging circuit 1 is arranged in the corresponding charger 2, and the charger 2 is equipped with a corresponding power input port and a charging port.

[0065] Exemplarily, the electrical equipment 3 is an agricultural plant protection drone.

[0066] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A charging circuit, characterized in that: The invention comprises n sub-charging circuits and comparison modules, each of which comprises a DC / DC conversion module, a control module, a switch module and a voltage acquisition module. The input ends of all the DC / DC conversion modules are used to be electrically connected to a power supply, the output ends of the DC / DC conversion modules are respectively electrically connected to the first end of the switch module and the power supply end of the control module, the output ends of the n DC / DC conversion modules are connected in parallel, the control end of the switch module is electrically connected to the signal output end of the control module, the second end of the switch module is electrically connected to the first end of the voltage acquisition module, the input end of the comparison module is respectively electrically connected to the second ends of the n voltage acquisition modules, the output end of the comparison module is respectively electrically connected to the signal receiving ends of the n control modules, and the third end of the voltage acquisition module is used to be electrically connected to a battery module, wherein n≥2, and n is a natural number; The DC / DC conversion module is used to convert the voltage provided by the power supply into a first voltage to power the control module; the voltage acquisition module is used to acquire the voltage of the battery module and transmit the voltage of the battery module to the comparison module; the comparison module is used to compare the voltages of n battery modules, and when the voltages of the n battery modules are different, determine the battery module with the lowest voltage, and send a first signal to the control module corresponding to the battery module with the lowest voltage, and send a second signal to the control modules corresponding to the remaining battery modules; wherein the first signal is used to instruct the control module to control the switch module to be turned on, and the second signal is used to instruct the control module to control the switch module to be turned off.

2. The charging circuit according to claim 1, characterized in that: The DC / DC conversion module includes a DC / DC conversion unit, a positive input end of the DC / DC conversion unit is used to be electrically connected to the positive electrode of the power supply, a negative input end of the DC / DC conversion unit is used to be electrically connected to the negative electrode of the power supply, a positive output end of the DC / DC conversion unit is respectively electrically connected to the first end of the switch module and the positive power supply end of the control module, a negative output end of the DC / DC conversion unit is respectively electrically connected to the negative power supply end of the control module and the negative electrode of the battery module, and the positive output ends of n DC / DC conversion units are connected in parallel.

3. The charging circuit according to claim 2, characterized in that: The DC / DC conversion module also includes a first diode, an anode of the first diode is electrically connected to the positive output terminal of the DC / DC conversion unit, a cathode of the first diode is electrically connected to the first end of the switch module and the positive power supply terminal of the control module, respectively, and the cathodes of n first diodes are connected in parallel.

4. The charging circuit according to claim 2, characterized in that: The switch module includes a switch tube, a control end of the switch tube is electrically connected to the signal output end of the control module, a first end of the switch tube is electrically connected to the positive output end of the DC / DC conversion unit and the positive power supply end of the control module respectively, and a second end of the switch tube is electrically connected to the first end of the voltage acquisition module.

5. The charging circuit according to claim 1, characterized in that: The voltage acquisition module includes a first resistor and a second resistor, wherein the first end of the first resistor is used to be electrically connected to the positive electrode of the battery module, the second end of the first resistor is electrically connected to the second end of the switch module, the input end of the comparison module and the first end of the second resistor respectively, and the second end of the second resistor is grounded.

6. The charging circuit according to claim 5, characterized in that: The voltage acquisition module also includes a first capacitor, a first end of the first capacitor is electrically connected to the second end of the first resistor, the first end of the second resistor, the second end of the switch module and the input end of the comparison module respectively, and a second end of the first capacitor is grounded.

7. The charging circuit according to claim 2, characterized in that: The control module includes a microprocessor, a signal receiving end of the microprocessor is electrically connected to the output end of the comparison module, a positive power supply end of the microprocessor is electrically connected to the positive output end of the DC / DC conversion unit and the first end of the switch module, a negative power supply end of the microprocessor is electrically connected to the negative output end of the DC / DC conversion unit and the negative electrode of the battery module, and a signal output end of the microprocessor is electrically connected to the control end of the switch module.

8. A charger, characterized in that: The charging circuit comprises the charging circuit described in any one of claims 1 to 7.

9. An electrical device, characterized in that: comprising an adaptable and connected electrical device and the charger as claimed in claim 8; or, The invention comprises an adaptably connected battery module and a charging circuit as claimed in any one of claims 1 to 7.

10. The electrical device according to claim 9, characterized in that The power-consuming equipment is an agricultural plant protection drone, or, The electrical equipment is an agricultural plant protection drone.

Images